Relay



Nov. 9 1926.

R. A. HEISING RELAY Filed Nov. 7. 1925 Patented Nov. 9, 1926.

UNITED i sTATEs PATENT oFFlcE.

RAYMOND HEISING, OF MILLIBURN, NEW JERSEY, ASSIGNOR TO IBELL TELEPI-IONE LABORATORIES, INCORPORATED, F NEW YORK, N. Y., A CORPORATION OF NEW YORK.

RELAY.

Application led November 7, 1925. SerialA No. 67,528.

This invention relates to relays and more.

particularly to a high speed sensitive relay.

In connection with certain apparatus, such -as a signal strength recorder, it is necessary to use a relay adapted to operate in response tocurrent values not greater than 1 micros ampere. A relay suitable for this purpose comprises a magnetized core provided with a gap in which a movable coil is supported l0 by its armature, the current to be measured being supplied to the movable coil. However, when such a relay is associated with a space discharge device there is produced in the movable coil a counter-clectromotive force of suiicient magnitude to materially impede the operation of the relay, unless a high resistance is inserted in series with the space discharge device. resistance is objectionable as the sensitivity of the relay is thereby reduced and consequently a larger current is necessary to operate it.

It is an object of this invention to provide a high speed sensitive relay.

u Another object is to provide a relay which will operate at highspeed in response to the small current strengths available in the anode circuit of a space discharge device.

These objects, and others which will be apparent as the nature of the invention is disclosed, are accomplished by employing a movable coil relay of the type described above having one coil connected in the plate circuit of a space discharge device and a second soil included in the grid circuit of the device. The back electromotive force, inf duced in the first coil by its movem'ent in the magnetic field of the relay, is neutralized by the control action of the electromotive force 40 produced in the second coil upon the grid of the device.

Although the novel features which are believed to be characteristic of this invention will be pointed out with particularity in the claims appended hereto, the invention itself, as to its objects and advantages, the manner of its organization and the method of its operation will be better understood by referring to the ollowing description taken in connection with the accompanying drawin forming a part thereof, in which:

ig. 1 illustrates dagrammatlcally one embodiment of this invention.

The use of such a In the operation of this system,

Fig. 2 illustrates a dierent embodiment thereof; and

Fig. 3 is an elevation, partly in section, of one design of relay which may be used in the systems shown in Figs. 1 and 2.

Referring to the system illustrated in Fig. 1 currents, in response to which it is des lred to operate a relay, are received from line l and impressed by means of transformer 2 upon the input circuit of space discharge device 3. The anode circuit of device 3 includes the movable coil 4 of the relay and a space current source 5. A source 7 supplies to the control electrode or grid of the device 3 a polarizing potential of such value that normally no current iiows through the coil 4. A second movable coil 6, mechanreally united tocoil 4, is included, in series with grid polarizing source 7, in the input circuit of space discharge device 3.

Coils 4 and 6 are secured to the armature or bar 12.

The relay R comprises a core having a central member -8 and laterally projecting poles 9 and 10 spaced from the central member 8 to provide a gap. Current is supplied rom av source (not shown) toa coil 11 wound on the central member 8 Jtof'magnetize thecore, whereby a magnetic fieldis produced across the gap. V `A Current transmitted over the line 1 and impressed upon the input circuit of device 3 will cause current to flow through its output circuit, and coil 4 will be energized to produce a magnetic eld. YThis iield cooperates with that produced between the member 8 and poles 9 and 10 to move coils 4 and 6 .relatively to the member 8. The movement of coils 4 and 6 actuates the armature or bar` 12 in such manner'that contacts 13 and'14 are alternately closed depending upon the position of the coils.

when the current impressed u on detector 3 from line 1 is less than a pre etermined amount, coils 4 and 6 and associatedbar 12 will be in such position that contact 13 will be closed. As the current impressed upon the device increases, coil 4 is displaced downwardly on core 8, in the magnetic ield between pole pieces 9 and 10. As this movement takes place, a counter-electromotive force is produced in the coil, which tends to oppose shown in Fi further increase in current. This counterelectromotive force is compensated for, however, b means of the otential induced in y the downwar movement thereof in connection with coil 4.

'Coil 6 is so connected in the circuit that the grid of space discharge device 3 will tend to become more positive in response to downward displacement, thereby allowing more current to low in the anode circuit. v J

For efficient on eration ofthis system the ratio of turns o coil 4 and coil 6 should be equal to the amplification constant of tube sponding to those of Fig. 1 have been given similar reference numerals. SpaceI dischar e device 3 of Fig. 2 is adapted to' recti directly in the plate circuit the alternating -current impressed from line 1 through transformer 2 upon its input circuit. In this figure no separate space current source is shown, but the rectifying properties of the tube are utilized to supply space current derived from the energy transmitted over the line 1. This method of supplying space current to the discharge device 3 could be used in the arrangement re 1. Theoperation .of this s stem will e entirely similar to that of t e system shown in Fig. 1, inasmuch as the back electromotive force induced in coil 4, by movement thereof in the magnetic field, will be compensated for by the rid polarizing electromotive .force generated in coil 6 of the relay.

Both contacts y13 and 14 may be used to close circuits to any apparatus which may Y be used and controlled m response to current values in line 1.

The relay shown more in detail in Fig. 3 comprises a central core 48 associated -with pole pieces 9 and 10, forming in connection therewith" a small air gap, in which coils .4

l and 6 are adapted to move. Core 8 and 'le pieces.' 9 andflO are energized by coi `11 -which consists of a suilicient number of turns-to provide the necessary field strength between the pole pieces. Coils 4 and 6- areas a single memconstructed mechanicsill1 12 which 1s pivoted ber and suspended n vat support 15 and maintained by means of spring 16 in such position that contacts 13 and 14 are normally open. The downward movement of coils 4 and'6 in the magnetic field will close contact 14- and an upward movement thereof will close contact 13.

to variations in signal strength is greatly facilitated and the utility of the apparatus is substantially increased.

Although this invention has been shown and described as applied to a particular system operating in a particular manner, it is not to be limited thereto but only' in accordance with vthe scope of the invention as deiined 'bythe following claims.

What is claimed is: A

1. A relay comprising means for pro- 4 ducin a magnetic field, coils movable in said eld, and` means controlled by the movement of one of said coils for compensating the back electromotive force induced in the other of said coils.

2. A relay comprising a core provided with a gap, means for energizing said core to produce a magnetic field in said ga an armature, a lurality of coils movab e in said ga an carried by said armature,

means or actuatin said coils, and means controlled by one o said coils to neutralize the back electromotive force 'induced in the other of said coils.

3e In combination with a s ace discharge device having an anode, cat ode and grid or control element, a relay com rism means for producing a. magnetic lie d an a pair of coils mova le in said field so connected to the electrodes of said space discharge-device that the back electromotive force produced by movement of one of said coils is neutralized by that produced in the other of said coils.

4. In combination with a space discharge device having an anode,xcathode and grid, a relay com risin meansfor producing) a magnetic fie d 'and a pairof coils mova le in said field, one of said coils bei connected to the vgrid andthe other o said coils being connected tothe anode -of said s ce discharge device in 'sucha manner t at the back electromotive force in one yof said coils by movement t ereof in the ma etic field is neutralized by the electromotive force produced in the other of said coils.

5. In a relay system including a space discharge device, means for producing a ma etlc field, a air of coils movable in sai field, said co' s being connected to the roduced v various electrodes of said space discharge coils, a vvpair of contacts and means for device in such a manner that the eleotroclosing said contacts alternately in response 10 motive force produced across two electrodes to the movement of said coils.

by IIlOVeIIlentI Of one of said coils in the In. Witness whereof, I hereunto subscribe 5 lmagnetic eld is colrlpensated for by the my name this 6th day of November A. D.;

potential impressed upon said third elec- 1925.

trode in response to the electromotive force K produced by movement of the other of said RAYMOND A. HEISING. 

